Github Action: Coveralls (#298)

* Create coveralls.yml

* Update .travis.yml

* Update package.json

* Update coveralls.yml

* Update coveralls.yml

* Update coveralls.yml

* Update coveralls.yml

.github/workflows/coveralls.yml

@@ -0,0 +1,35 @@
+on: ["push", "pull_request"]
+
+name: Coveralls
+
+jobs:
+
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+
+    - uses: actions/checkout@v1
+
+    - name: Use Node.js 12.x
+      uses: actions/setup-node@v1
+      with:
+        node-version: 12.x
+
+    - name: npm install, npm test:coverage
+      run: |
+        npm install
+        npm run test:coverage
+      env:
+        CI: true
+
+    - name: Coveralls Parallel
+      uses: coverallsapp/github-action@master
+      with:
+        github-token: ${{ secrets.GITHUB_TOKEN }}
+        path-to-lcov: ./coverage/lcov.info # optional (default value)
+
+    - name: Coveralls Finished
+      uses: coverallsapp/github-action@master
+      with:
+        github-token: ${{ secrets.GITHUB_TOKEN }}